Water unit resources

http://co.water.usgs.gov/infodata/

http://www.waterinfo.org/indian.html

http://geology.com/usgs/high-plains-aquifer.shtml

http://academic.evergreen.edu/g/grossmaz/WORMKA/

http://www.umac.org/ocp/videos/freshWater.html

http://en.wikipedia.org/wiki/Ogallala_Aquifer

http://ga.water.usgs.gov/edu/waterdistribution.html

http://ga.water.usgs.gov/edu/earthwherewater.html

http://ga.water.usgs.gov/edu/watercycle.html

http://response.restoration.noaa.gov/topic_subtopic_entry.php?RECORD_KEY(entry_subtopic_topic)=entry_id,subtopic_id,topic_id&entry_id(entry_subtopic_topic)=447&subtopic_id(entry_subtopic_topic)=27&topic_id(entry_subtopic_topic)=3

http://ga.water.usgs.gov/edu/watercyclegwstorage.html

http://www.purdue.edu/dp/envirosoft/groundwater/src/supply.htm

http://www.epa.gov/safewater/kids/flash/flash_watercycle.html